Developer tools — Page 2
165 focused tools, ready to use in your browser.
cURL and HTTP Request Workbench
Convert a safe cURL subset into an HTTP request summary without executing it.
DeveloperHTTP Header Workbench
Parse ordered HTTP fields or export a validated JSON header list.
DeveloperHTTP Cache Policy Analyzer
Calculate explicit HTTP freshness from supplied response headers and timing.
DeveloperCORS Policy Tester
Evaluate a supplied CORS response against an origin, method and credentials scenario.
DeveloperWebSocket Frame Inspector
Decode one captured WebSocket frame and unmask its bounded payload.
DeveloperIP Subnet Workbench
Calculate exact IPv4/IPv6 CIDR bounds, address count and membership.
DeveloperUser Agent Inspector
Inspect a supplied user-agent string without collecting device fingerprints.
DeveloperCSS Clamp Generator
Derive fluid CSS clamp sizing from two viewport and size anchor points.
DeveloperTypography Scale and Token Generator
Build a bounded type-size ladder and named role styles as CSS custom properties or JSON tokens, using your own base and ratio.
DeveloperCSS Border Radius Workbench
Generate eight-value elliptical corner CSS, calculate overlap scaling and preview the resulting rounded rectangle locally.
DeveloperHTML Formatter and Minifier
Format static HTML or remove ordinary comments while preserving all other source characters.
DeveloperCSS Formatter and Minifier
Format a CSS stylesheet or serialize its syntax tree with compact token spacing.
DeveloperJavaScript Formatter and Minifier
Format JavaScript or compact parsed script/module source without executing it.
DeveloperJavaScript AST Explorer
Inspect syntax-node types and source ranges in a JavaScript script or module.
DeveloperStatic Module Dependency Graph
Map supplied JavaScript modules, unresolved imports and dependency cycles locally.
DeveloperCSS Selector Specificity Analyzer
Calculate selector specificity tuples, including supported functional selector rules.
DeveloperCSS Custom Property Resolver
Resolve var() references, fallbacks and cycles in an explicit custom-property map.
DeveloperHTTP Message Framing Inspector
Inspect one supplied HTTP1 message and decode strictly bounded chunked content offline.
DeveloperContent Disposition Workbench
Build download headers or inspect international filename parameters safely.
DeveloperMultipart Form Body Workbench
Build ordered text/file-like parts or inspect a bounded Base64 multipart body.
DeveloperTLS ClientHello Inspector
Decode captured ClientHello record bytes without making a TLS connection.
DeveloperIP CIDR Set Aggregator
Merge IPv4/IPv6 CIDRs or calculate exact set intersection and difference.
DeveloperURI Template Expander
Expand supported RFC6570 URI templates from explicit scalar, list and map variables.
DeveloperPermissions Policy Workbench
Build or inspect supported Permissions-Policy headers and iframe allow grammar.
DeveloperPostgreSQL Query Plan Explorer
Explore supplied EXPLAIN JSON with node hierarchy, estimates and explicitly labeled actual metrics.
DeveloperSource Map Explorer
Decode basic version3 source maps and inspect generated/original mapping anchors.
DeveloperDNS Wire Message Workbench
Build an offline DNS query or inspect a bounded captured DNS wire message.
DeveloperWebAssembly Binary Inspector
Inspect selected WebAssembly section ranges, imports, exports and declared memory limits without execution.
DeveloperDevelopment Key Pair Generator
Generate local test signing keys with an explicit private-key export choice.
DeveloperKey Derivation Test Workbench
Compute reproducible HKDF or PBKDF2 vectors from explicit hexadecimal inputs.
DeveloperOAuth PKCE S256 Workbench
Generate a random PKCE verifier/challenge or check a supplied S256 pair locally.
DeveloperHTTP Digest Authentication Test
Reproduce a supported qop=auth MD5 or SHA256 response from explicit test fields.
DeveloperSupported Schema to TypeScript
Translate declared schema structure into a TypeScript source type with explicit runtime-constraint caveats.
DeveloperSet-Cookie Attribute Workbench
Inspect separate Set-Cookie fields or build a header from explicit cookie attributes.
DeveloperSSH Authorized Keys Options Inspector
Inspect authorized_keys options, supported public-key records and SHA256 fingerprints locally.
DeveloperOIDC Metadata and JWKS Consistency Checker
Compare supplied discovery metadata and public JWKS without contacting an identity provider.
DeveloperHTTP Structured Fields Workbench
Parse and canonically serialize RFC9651 Items, Lists and Dictionaries with typed values.
DeveloperStatic HTML ID Namespace Rewriter
Prefix HTML IDs and known local ID references while preserving all unmodified source bytes.
DeveloperServer-Sent Events Stream Workbench
Parse event-stream source or create an SSE artifact from explicit event data without opening a connection.
DeveloperWebSocket Opening Handshake Workbench
Calculate a WebSocket accept value from a supplied key and compare an optional server accept field locally.
DeveloperJSON-RPC Envelope and Batch Workbench
Inspect JSON-RPC 2.0 envelopes or correlate supplied batch replies with exact request IDs.
DeveloperHTTP Byte Range Workbench
Resolve Range fields against an explicit representation length or inspect a Content-Range field with exact integers.
DeveloperHTTP Conditional Request Workbench
Evaluate supplied ETags and modification dates in the HTTP precondition precedence order.
DeveloperHTTP Digest Field Workbench
Generate or compare SHA-256 and SHA-512 HTTP digest fields against explicitly supplied bytes.
DeveloperForwarded Proxy Header Inspector
Inspect Forwarded proxy elements, quoted node identifiers and per-hop parameters without trusting the chain.
DeveloperHTTP Authentication Challenge Workbench
Separate authentication challenges from their comma-separated parameters and produce a normalized field value.
DeveloperHTTP Link Header Workbench
Inspect Link targets, relation types, anchors and UTF-8 titles using a supplied response URI.
DeveloperHTTP Content Negotiation Workbench
Compare supplied media types, content codings or language tags with explicit Accept field preferences.